In testing the difference between two population means using two independent samples,the sampling distribution of the sample mean difference $\overline { \mathrm { x } } _ { 1 } - \overline { \mathrm { x } } _ { 2 }$ is normal if the:
A) sample sizes are both greater than 30.
B) populations are normal.
C) populations are non-normal and the sample sizes are large.
D) population sizes are both greater than 30.
E) all of these are required conditions.

Question

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The Answer of In testing the difference between two population means using two independent samples,the sampling distribution of the sample mean difference $\overline { \mathrm { x } } _ { 1 } - \overline { \mathrm { x } } _ { 2 }$ is normal if the:
A) sample sizes are both greater than 30.
B) populations are normal.
C) populations are non-normal and the sample sizes are large.
D) population sizes are both greater than 30.
E) all of these are required conditions.

In Testing the Difference Between Two Population Means Using Two x‾1−x‾2\overline { \mathrm { x } } _ { 1 } - \overline { \mathrm { x } } _ { 2 }x1​−x2​

In Testing the Difference Between Two Population Means Using Two $\overline { \mathrm { x } } _ { 1 } - \overline { \mathrm { x } } _ { 2 }$